I saw this and smiled. What a delightfully simple design for a clock with easy daylight savings adjustment. Only one downside – accidentally knock it without realising, or more likely have a mischievous friend knock it deliberately - and you'll be an hour out. So I'd be tempted to add "Summer" and "Winter" or some neat icons along the flat edges to make it obvious what setting it's currently on. That also solves the problem of knowing what position it's supposed to start off in when you get it.